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Old 10-07-2021, 11:51 PM   #1
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Brake light on

I just brought a 2001 Winnebago Adventurer 35U on the way home from the person i got it from the brake light came on. I done a little trouble shooting ,but i am not familiar with system. The person i got it from said that the onl brake problem he had was a brake line was leaking under body. line was replaced and breaks bleed. Anyone know what the problem could be.
THANKS
TJ
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Old 10-07-2021, 11:57 PM   #2
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Do you mean the brake lights on the back of the RV or is it the ABS light on the dashboard?

What chassis?
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Old 10-08-2021, 12:46 PM   #3
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Quote:
Originally Posted by tjhchief1935 View Post
I just brought a 2001 Winnebago Adventurer 35U on the way home from the person i got it from the brake light came on. I done a little trouble shooting ,but i am not familiar with system. The person i got it from said that the onl brake problem he had was a brake line was leaking under body. line was replaced and breaks bleed. Anyone know what the problem could be.
THANKS
TJ
Well,
Not being familiar with that particular model, can I assume it's a gas class A? If so, since that coach just had some BRAKE (not "break") work done, and, as stated, it *may* have had the brakes bled, it's possible that, the system is somewhat *unbalanced*. Your hydraulic brake system, is divided into the fronts, and the rears. In the old days, there used to be, and maybe todays (and your year model coach) vehicles still have one, a component in the brake system called an *equalizer* or a *balancer*(maybe not the actual technical term but, it means the same). It was a little manifold where the front and rear brake lines converged and exited back out again. But, in the middle of that manifold, was/is a sensor.

Inside that manifold, was a two way piston. The two ends had a void in the middle. The sensor resided in that void. As long as your brake system is properly functioning, as in no excessive travel of any brake parts when the brakes are being applied, that little piston in that manifold floats back and forth but, predominantly stays very near the middle of it's travel. Now, if at any time, either the front brake system or the rear brake system developed a leak or, anything that could cause a larger use of brake fluid to be needed to apply the problem brakes, that piston would move to the low side or problem side. When that happens, it now grounds that sensor and, vuuuualllllla, you have a BRAKE LIGHT come on, in the dash. Now again, you state your brake system was recently worked on, correct?

Soooo, is all of what I explained maybe your problem? Not a clue. One more reason your Brake light can come on is, if the adjustment for your parking brake is not up to par. That little switch on the parking brake system I think, if I recall, might have an adjustment on it to make sure it goes ON when the parking brakes are applied but also, it must go OFF when the parking brakes are released. So, there's a couple of things to possibly check out. Good luck and do report back on the answer so that others may learn.
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Old 10-09-2021, 01:42 PM   #4
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I have the same model. Do yourself a favor and try an easy thing first. Have a look at the micro switch for the parking brake.
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Old 10-09-2021, 04:30 PM   #5
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Check the brake fluid.
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Old 10-14-2021, 03:50 PM   #6
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The brake light in the dash also comes on when there is a problem with the J71, (or J72) AAPB is not working correctly.
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Old 10-19-2021, 07:25 PM   #7
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brake light

Check out the auto park brake. The light comes on when that is engaged. If your e-brake shoes are worn, the e-brake could be engaged without your knowledge. There is a reservoir in the front of the engine that should be filled with transmission fluid that provides the hydraulic pressure to engage the e-brake around your drive line. If there's a defective switch (yellow placarded knob on dash), e-brake could be engaged.


Comes from a personal experience with a 2001Adventurer.
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Old 10-19-2021, 07:32 PM   #8
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Spring pressure engages the park brake, hydraulic pressure releases it and keeps it released.
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Old 10-19-2021, 08:07 PM   #9
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tjhchief1935 Any luck yet?
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Old 10-20-2021, 03:54 PM   #10
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Brake light

The brake light is still on.Fluid good . Trying to find someone to check it out..Have not driven it since it happened. Wife is ready to go camping.

Thanks all for responding.

TJ
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Old 10-20-2021, 03:59 PM   #11
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Let us know what you find...curious minds would like to know.
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Old 10-21-2021, 11:07 AM   #12
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Thomas;

Is your chassis build by Workhorse by any chance? I owned a 2003 Chieftain on a Workhorse chassis. I had a similar problem. It started by the cruise control drooping off like it is supposed to do when you touch the brake peddle. I found the brake lights were on. I looked under the dash and found the brake light switch was was not touching the arm to the brake peddle. It was kicking off the cruise control and turning on the brake lights.

I noticed that the mount had some plastic ridges the switch was mounted in. I purchased a large water pump pliers and was able to squeeze the switch a notch closer to the brake peddle arm and that solved the problem. I carried the pliers with me in the MH because about twice a year I had to make that adjustment until I traded it. Just my .02 worth.

Good luck;

Don
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Old 10-22-2021, 06:54 AM   #13
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Originally Posted by tjhchief1935 View Post
The brake light is still on.Fluid good . Trying to find someone to check it out..Have not driven it since it happened. Wife is ready to go camping.

Thanks all for responding.

TJ

A lot depends on which brake light we are talking about. The ABS light can come on due to a dirty ABS sensor while you can on some chassis get a red brake light for things as simple as the parking brake not being fully released.

On a 2001 35U you either have a Ford F53 or Workhorse chassis. Both will be HydroBoost systems with the Power Assist coming from the power steering pump. The Ford will have a manual parking brake while the Workhorse an electrically activated hydraulic (meaning a second master cylinder hidden under the floor of the coach that needs to be flushed and refilled regularly just like the service brakes) parking brake. The Workhorse can have the added issue of defective brake calipers that should have been replaced under a recall while the Ford had a recall on the brakes due to the pressure switch being located under the master cylinder where it could get shorted out by any brake fluid that seeped out.

Gas Class A Motor Homes are considered to be operating at Severe Service Levels so brake fluid needs to be completely flushed out and replaced every 2 years.
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